试剂
电位滴定法
微电池
检出限
化学
电极
大细胞
抗氧化剂
色谱法
相关系数
分析化学(期刊)
计算机科学
数学
生物化学
有机化学
统计
操作系统
物理化学
电信
基站
作者
Alla V. Ivanova,Maria G. Markina
出处
期刊:Sensors
[Multidisciplinary Digital Publishing Institute]
日期:2023-09-13
卷期号:23 (18): 7845-7845
被引量:2
摘要
For the first time, a prototype of a portable device for the potentiometric determination of antioxidant capacity based on a new measurement principle is proposed. A feature of the approach is the use of an electrochemical microcell with separated spaces and two identical electrodes with immobilized reagents. An antioxidant solution is introduced into one half-cell, and the antioxidants interact with the reagents. The other half-cell contains only reagents. The potential difference between the electrodes is due to the change in the ratio of the oxidized and reduced form of the reagents, which occurs as a result of the reaction with the antioxidants in one of the half-cells and is related to their concentration. The range of linearity of the microcell with immobilized reagents is 40–4000 μM-eq, and the limit of detection is 20 μM-eq. The device was successfully tested in the analysis of standard antioxidant solutions. The recoveries were (92–113)%, and the relative standard deviation did not exceed 15%. A good correlation was found between the data obtained by the approach and the potentiometric method in a macrocell for fruit juice analysis. Pearson’s coefficient for the obtained experimental data was 0.9955. The proposed portable device is promising and can be used in field conditions.
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